68135842 has 4 divisors (see below), whose sum is σ = 102203766. Its totient is φ = 34067920.

The previous prime is 68135831. The next prime is 68135869. The reversal of 68135842 is 24853186.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 35176761 + 32959081 = 5931^2 + 5741^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17033959 + ... + 17033962.

Almost surely, 2^68135842 is an apocalyptic number.

68135842 is a deficient number, since it is larger than the sum of its proper divisors (34067924).

68135842 is a wasteful number, since it uses less digits than its factorization.

68135842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34067923.

The product of its digits is 46080, while the sum is 37.

The square root of 68135842 is about 8254.4437729020. The cubic root of 68135842 is about 408.4371236186.

It can be divided in two parts, 6813584 and 2, that added together give a triangular number (6813586 = T₃₆₉₁).

The spelling of 68135842 in words is "sixty-eight million, one hundred thirty-five thousand, eight hundred forty-two".